GERMAN DEMOCRATIC REPUBLIC - CIRCA 1953: A Stamp Printed In Germany From The "Five Year Plan" Issue Shows Engineers, Circa 1953. Stock Photo, Picture And Royalty Free Image. Image 48529053.
Datei:Stamps of Germany (DDR) 1961, MiNr 0847.jpg – Wikipedia
Philaseiten.de: DDR Spezial: Dauerserie Walter Ulbricht - Wasserzeichen bestimmen